Place it right after the question is asked in your edit, so it answers the setup on its own. Follow it with the Nope sound for a firm refusal, or use it before a shrug reaction to build a short run of similar replies.
Sobre este som
This is a very short voice clip of Angel from Borderlands 2 saying 'I dunno' in a flat, uncertain tone, lasting just over a second. It feels awkwardly funny, like a shrug in audio form when someone clearly has no answer. The line comes from a Zer0 ECHO recording in Borderlands 2.